<![CDATA[This study aims to identify and describe student errors based on concepts errors, principles errors, and operations errors in solving quadratic equation material. This type of research is descriptive qualitative. The subjects of this study were the IX grade students of MTs Al-Huda Dolok Sinumbah Simalungun in the 2021/2022 academic year as many as 20 people, and the samples were taken were 10 people with the most error criteria. Data was collected using a written test. Based on the results of data analysis, it can be found that students' errors in solving quadratic equations are: (1) conceptual errors, namely not knowing the concept of determining a quadratic equation, not knowing the concept of finding the roots of a quadratic equation, and not knowing the concept of determining a new quadratic equation. (2) principles errors, namely students do not know how to determine quadratic equations. (3) operation errors, namely student errors in calculating multiplication results. Keywords: Error Analysis, Quadratic Equation]]>
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